Improvement in burglar-alarms



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INVENTOR a? w W noB EnrLEn or CINCINNATI, OHIO.

Letters Patent No. 112,359, datedlllarch 7,1871.

IMPROVEMENTIN BURGLAR-ALARMS.

The Schedule referred to in these Letters Patent and making part of the name.

I, IROBERT of Cincinnati, Hamilton county,

Ohio, have invented anew anduseful Burglar-alarm Bolt, of which the following is a specification.

Ndtut'dttitd 5 Object of the Detention. I My invention relates to-abolt "or knob-latch adapted to operate as anfordinaryfastening,and in connection with a spring-hammer or pcrcussor,-as an alarm. 'lhe bolt is soarranged as to operate independently \of the alarm-hammer when desired. It forms the I trigger or detent of the hammer, and remains pro- I truded after thesame is released.

l The hammer is'so constructed and arranged that the act of cooking it will serve to throw and lock the bolt.

Eigure 1 is a perspective view, representing a doorbolt provided with my alarm, the bolt" being looked and the alarm set. p v p I l Figure 2 is a similar view with the alarm-spring.

- Figures 3 and 4 are longitudinal sections of the boltin positions corresponding to figs, land 2, respectively.

The bolt A narrows, by beveled surface, a, to its shank, B, so-as, when protruded from the case 0, to be capable of a slightlateral play in the slot c, whose side nearest the room it is caused to bug or press by aspring, D, secured tothe' back plate of the case. Projecting from bolt A isa custolnary l1andle, E which traverses agslot, a, inthe case.

A shoulder, F, on that side of the bolt A most remote from the spring D, receives the sear. or heel G of a hammer or percussor, H, having .a nipple, I, for a percussion-cap, a spiraL spring, J, for springing the ,hammerwhen liberated, asihereafter explained, and a lip or handle, It, for-{cocking it.

' The bolt isfguided to its proper path by suitable stumpsjK. l [:A suitable stump,--I1, receives the impact of the hammer.

I Operation.

The hammer being uncocked,ias in fig. 2, the bolt can be protruded or retracted in the ordinary manner without sounding the alarm. I I

Whcnihe inmate (lfztlld room desires to set the alarm, he draws the hammer into cock a's in fig. 1.

This action brings its heel endwise against the shoulder F on the bolt, and effectually locks the latter.

The cooking of the hammer may be then done either with-the protruded or the retracted bolt, because the act of cooking operates to protrude the bolt-asefl'ectively as though protruded by the handle itselfi Thehammer being set or cocked, theslightest press-- ure inward against the door causes sufiieient'lateral deflection of the bolt to liberate from its shoulder the a heel of the hammer, so as to permit the coiled spring of the latter to come into play, and to project the hammer violently against the stump L, and thus to discharge the .cap.

Should it be desired to unholt the door without sounding the alarm, the occupant of the room simply draws back the hammer with one hand and pulls the door to ward-him with the other hand. This latter action operates to disengage the heel of the hammer, and allows the latter to be let gently down uponthe stump in the manner familiar to those who h'andle lire-arms.

,The act of cocking throws and locks the bolt. Although described for doors, the device is equally applicable to windows when applied on thepartingrail of the sash. I I I I do not claim a laterally-yielding bolt or latch as a trigger for an'alarm, nor the adaptation of such bolt to form a permanent fastening, northe combination (broadly considered) of a hammer with such laterallyy'ielding bolt or latch, as means for-sounding an alarm.

Claim.

. I claim as new and of my invention- In combination with the laterally-yielding bolt A, forming a fastening and detent or trigger, as described, the hammer or percussor H, with its sear or heel G and spring J, for throwing and locking the said bolt and sounding the alarm, constructed and operating substantiallyas shown and set forth.

In testimony of which invention I hereunto set my hand.

' v ROBERT LEE.

Witnesses:

Gno. H. KNIGHT, J AME; I-I. LAYMAN. 

